Willdan Energy Solutions
Recently activeSolar installer based in California · installer record #60498 resolved from 10 public installation records.
At a glance
Willdan Energy Solutions is a solar installer with 10 recorded installations totalling 1.9 MW, dated 2021 to 2025. All of its records are in California, where it ranks 4321st of 6,010 profiled installers by volume and 7,455th of 10,537 nationally.
Track record
Install volume by year
Recorded installs per year; prices by year are in the table below.
Pricing
Price by year (solar only)
| Year | Priced systems | Willdan Energy Solutions | California median | vs state |
|---|---|---|---|---|
| 2025 | 7 | $5.86/W | $3.29/W | +78% |
Median installed price per DC watt before incentives, systems without a battery, by the year in the public record. Years with fewer than five priced systems are left out.
Why a company's own figure can differ from this one
- Timing. These prices come from state incentive filings, published about once a year, so the latest full year here is 2025. Prices moved down in many states after 2023; a company's current quotes can be lower (or higher) than its last full year on record.
- Dates.A filing is dated when the program processed it, not when the job was sold, so jobs can land in a different month or year than in the company's own books.
- What the price includes.The filed price is the whole project as reported to the program, which can include loan dealer fees, electrical panel upgrades or roof work. A company's internal figure often leaves those out.
- Batteries.Systems flagged with a battery are excluded here; a battery the filing didn't flag can still raise a year's median.
Latest records
Most recent recorded installs
| Date | Location | Size | Price | Ownership |
|---|---|---|---|---|
| Dec 18, 2025 | Lakewood, CA | 208.8 kW | $630,630 | Host-owned |
| Nov 10, 2025 | Fairfield, CA | 90.8 kW | $593,000 | Host-owned |
| Oct 29, 2025 | Paramount, CA | 141.6 kW | $1,045,917 | Host-owned |
| Oct 16, 2025 | Paramount, CA | 610.7 kW | $12,344 | Third-party |
| Oct 16, 2025 | Paramount, CA | 118 kW | $13,530 | Host-owned |
| Jun 4, 2025 | Paramount, CA | 157.1 kW | $888,000 | Host-owned |
| May 21, 2025 | Oakhurst, CA | 128 kW | $750,000 | Host-owned |
| May 12, 2025 | Oakhurst, CA | 300 kW | $1,300,000 | Host-owned |
| Apr 24, 2025 | Coarsegold, CA | 174.5 kW | $1,100,000 | Host-owned |
| Oct 25, 2021 | Jacumba, CA | 3 kW | — | — |
Service geography
Busiest cities
Record
- Installer ID
- PC-60498
- First recorded install
- Oct 25, 2021
- Last recorded install
- Dec 18, 2025
- Priced records
- 7
Is this your company?
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How does Willdan Energy Solutions compare with other installers in California?
By recorded installations Willdan Energy Solutions ranks 4321st among the 6,010 installers based in California with five or more records. Its median system, 149.3 kW, is about 25 times the state median of 5.9 kW. 10% of its recorded installations are third-party owned (lease or power-purchase agreement), against 29% across California. 0% include battery storage, compared with 16% of California records. Installers of similar recorded volume in California include Surge Electric (10), TOKAY MECHANICAL SERVICES INC DBA TOKAY HEATING AND AIR CONDITION (10) and WHITTAKER ELECTRICAL REPAIR & INSTALLATION (10).
How has Willdan Energy Solutions's installation volume changed?
Willdan Energy Solutions's earliest dated installation on record is from 2021. It has recorded installations in 2 calendar years. The busiest year was 2025, with 9 installations. The most recent recorded installation is dated Dec 18, 2025.
Where does Willdan Energy Solutions install solar?
All recorded installations are in California. The cities with the most of its installations are Paramount, CA (4), Oakhurst, CA (2), Coarsegold, CA (1), Fairfield, CA (1) and Lakewood, CA (1).
Frequently asked questions
How many solar installations has Willdan Energy Solutions completed?
PanelCensus records 10 installations by Willdan Energy Solutions, from Oct 25, 2021 to Dec 18, 2025, totalling 1.9 MW of capacity. Public reporting varies by state, so the company's true total may be higher.
What does Willdan Energy Solutions charge for solar?
The median installed price across 7 priced systems from all years is $5.86/W before incentives (median system 149.3 kW, about $888,000). The California median is $4.26/W. Prices are the total project cost reported to state programs, so they can include work billed with the solar.
Where does Willdan Energy Solutions install solar?
All 10 recorded installations are in California, the most of them in Paramount.
Is Willdan Energy Solutions still installing solar?
The most recent installation attributed to Willdan Energy Solutions in the public records is dated Dec 18, 2025; 2025 has 9 recorded installations. Records reach PanelCensus months to a couple of years after installation, so recent activity may not appear yet.
Does Willdan Energy Solutions install leased or PPA solar systems?
1 recorded installation by Willdan Energy Solutions (10%) is third-party owned — a lease or power-purchase agreement; across California the share is 29%.
Does Willdan Energy Solutions install battery storage?
0 recorded installations by Willdan Energy Solutions (0%) include a battery.
Related installers and places
- All solar installers in California· 6,010 profiles
- Solar installations in California· 2,408,542 records
- Surge Electric· 10 installations
- TOKAY MECHANICAL SERVICES INC DBA TOKAY HEATING AND AIR CONDITION· 10 installations
- WHITTAKER ELECTRICAL REPAIR & INSTALLATION· 10 installations
- WISE MONKEY RE-PIPE AND CONSTRUCTION· 10 installations
- WOO BROTHERS ELECTRIC INC· 10 installations
- CONTINUUM· 10 installations
Dataset updated . Sources: LBNL Tracking the Sun + permit and program records; installer resolved by exact-normalized name matching.
About this data
Source: Lawrence Berkeley National Laboratory's Tracking the Sun, merged with city permit records, state incentive programs and the USGS U.S. Large-Scale Solar Photovoltaic Database / EIA-860 plant registers, as published September 21, 2026 — PanelCensus refreshes it as each source publishes new records. See the methodology for how records are matched, cleaned and scored.
Cite as: PanelCensus, “Willdan Energy Solutions, solar installer (California)”, https://panelcensus.com/installers/california/willdan-energy-solutions-60498 (data as of September 21, 2026).